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Nis buy hash

I am using the testnet and have set up a local node. Obviously, I could just set the blockheight one higher BUT I want to know the blockhash before the next block is harvested. Best approach is to pull the last block and calculate the hash. There are functions to calculate the hash in java and javascript too i guess. Thanks for the answer - I am not sure exactly how to pull the block and hence the format of what I should be hashing. However, I presume that it will be in the docs somewhere so will investigate. I ran that through a sha hash function and got a hash of dd29ebb9ac35bef9bc62a8f95fd39b2ddddc86bdcdc7b0c. Obviously this is a different hash so I have experimented with different parts of the data but could not replicate the hash. I think it maybe something to do with the format of the data and what I am trying to hash - am I suppose to hash the whole block info string or just part of it? You need to build a byte array from the json object as shown in the link i gave you above and use a keccak hash calculator. Thanks - that makes sense. I will build the byte array using the assumption that it is formated it a similar style to the documented transactions byte arrays and use keccak Hi, I just met the similar problem. When using api to get the preBlockHash on height Hi, I know it can generate the signature by signing an array of bytes extracted from the params of transaction. Now we want to get from the signature to block hash or transaction hash, do you have any api to do this? Thanks for both of you for explaining. CryptoBeliever BloodyRookie. We are developing wallet with many coins including XEM and our node server is on AWS, and service server is not the same server, so it can not use the local call. Do you have other apis for getting block info and transaction info via specified height? Or other calculate method? As I understand service server can have other IP over time so changing config. CryptoBeliever OK, thanks a lot for your patient description. From config. Local api seems the only way to get calculated hash for block and transaction from api. Other way as you already mentioned could be calculate it manually. Any pointers will be appreciated. Here are the api docs. The block hash is the hash of the gathered block data. The signature is the signed block hash. You cannot derive the block hash from the signature. CryptoBeliever BloodyRookie We are developing wallet with many coins including XEM and our node server is on AWS, and service server is not the same server, so it can not use the local call. In such situation in previousBLockHash you have hash. Not sure if this will be helpful.

Hash Functions

Nis buy hash

Official websites use. Share sensitive information only on official, secure websites. Contact Us. See this announcement for details. Further guidance will be available soon. Send questions on the transition to shatransition nist. SHA-1 : Federal agencies should stop using SHA-1 for generating digital signatures, generating time stamps and for other applications that require collision resistance. SHA-2 i. NIST encourages application and protocol designers to implement SHA at a minimum for any applications of hash functions requiring interoperability. SHA-3 i. Guideline for using the XOFs will be provided in the future. September 28, SHA Federal agencies should stop using SHA-1 for generating digital signatures, generating time stamps and for other applications that require collision resistance. SHA When the SHA-3 hash algorithm becomes available, it may also be used for all applications that employ secure hash algorithms. March 15, The SHA-2 family of hash functions i. Federal agencies should stop using SHA-1 for digital signatures, digital time stamping and other applications that require collision resistance as soon as practical, and must use the SHA-2 family of hash functions for these applications after Regardless of use, NIST encourages application and protocol designers to use the SHA-2 family of hash functions for all new applications and protocols. Morris Dworkin morris. Security and Privacy: secure hashing. Cryptographic Standards and Guidelines Digital Signatures. You are viewing this page in an unauthorized frame window. Search Search. Technologies Sectors. Information Technology Laboratory. Computer Security Resource Center. Projects Hash Functions. August 5, SHA-1 : Federal agencies should stop using SHA-1 for generating digital signatures, generating time stamps and for other applications that require collision resistance. Contacts Morris Dworkin morris. Group Cryptographic Technology. Topics Security and Privacy: secure hashing. Created January 04, , Updated September 09,

Nis buy hash